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Proof step 68 from proof reachable-addnew-rev (
previous step
)
⊦ ¬ r2 ∈ H ∧ ¬ r2 ∈ x ∧ r ∈ H → (path(r ' + x, H[r2, ce]) ↔ path(r ' + x, H))
Lemma
path-new-irrelevant-strong